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首页> 外文期刊>RSC Advances >Morphology and performance relationship studies on biodegradable ternary blends of poly(3-hydroxybutyrate-co-3-hydroxyvalerate), polylactic acid, and polypropylene carbonate
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Morphology and performance relationship studies on biodegradable ternary blends of poly(3-hydroxybutyrate-co-3-hydroxyvalerate), polylactic acid, and polypropylene carbonate

机译：聚（3-羟基丁酸酯-CO-3-羟基戊烯），聚乳酸和聚丙烯碳酸酯的可生物降解三元共混物的形态学与性能关系研究

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摘要

A biodegradable ternary blend fabricated from polylactic acid (PLA), poly(3-hydroxybutyrate- co -3-hydroxyvalerate) (PHBV) and polypropylene carbonate (PPC) with a good balance of stiffness and toughness via optimizing the composition ratio and morphological structure is, to the best of the authors' knowledge, reported here for the first time. The optimal blend formulation is comprised of 20% PLA, 40% PHBV, and 40% PPC, which possesses a tensile strength measuring 44 MPa and an elongation at break measuring at 215%. Thermal performance analysis revealed an HDT value of 72 °C. The Harkins equation predicts that the three immiscible polymers formed a complete wetting morphology, which was confirmed by scanning electrical microscopy. As the PPC content of the ternary blends is increased, the material undergoes morphological transition from droplet to co-continuous structure, resulting in significant improvement of elongation at break (approximately 40 times higher than that of the PLA–PHBV binary blend). Excellent stiffness and over 200% elongation at break make these sustainable ternary blends feasible for use in packaging as substitutes for certain non-biodegradable petroleum-based single use plastics.
机译：通过优化组合物比和形态结构，由聚乳酸（PLA），聚（3-羟基丁酸酯-CO-羟基羟基）（PHBV）和聚丙烯碳酸酯（PPC）制成的可生物降解的三元共混物，具有良好的刚度和韧性平衡据作者所知，这是第一次报告的作者知识。最佳共混物制剂由20％PLA，40％PHBV和40％PPC组成，其具有测量44MPa的拉伸强度，并且在215％下的断裂伸长率。热性能分析显示出72°C的HDT值。 Harkins方程预测三种不混溶的聚合物形成完全润湿形态，通过扫描电显微镜确认。随着三元共混物的PPC含量增加，该材料经历了从液滴到共连体结构的形态转变，导致断裂伸长率的显着改善（比PLA-PHBV二进制混合物高约40倍）。优异的刚度和超过200％的断裂伸长率使得这些可持续的三元共混物可行用于包装作为某些非可生物降解的石油的单一使用塑料的替代品。

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